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(D) Let the current in both wires be $I$ and the distance between them be $d$. The midpoint is at a distance $r = d/2$ from each wire.According to the

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(D) Let the current in both wires be $I$ and the distance between them be $d$. The midpoint is at a distance $r = d/2$ from each wire.According to the Right-Hand Thumb Rule,the magnetic field $B$ produced by an infinitely long wire at a distance $r$ is given by $B = \frac{\mu_0 I}{2\pi r}$.Since the currents are in the same direction,at the midpoint,the magnetic field due to the first wire points into the plane (or out of the plane depending on orientation),and the magnetic field due to the second wire points in the opposite direction.Since the currents $I$ and distances $r$ are equal for both wires,the magnitudes of the magnetic fields are equal: $B_1 = B_2 = \frac{\mu_0 I}{2\pi (d/2)}$.Because the vectors are equal in magnitude and opposite in direction,the net magnetic field $B_{Net} = B_1 - B_2 = 0$.

Two infinitely long parallel wires carry equal current in the same direction. The magnetic field at a midpoint between the two wires is

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